GMAT Critical Reasoning

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In Berinia, the age at which people could begin to drink alcohol legally used to be 18. In 1990, in an attempt to reduce alcohol consumption and thereby to reduce alcohol-related traffic deaths among Berinians under 21, the legal drinking age was raised to 21. Alcohol-related traffic deaths among people under 21 have decreased significantly since 1990. Nevertheless, surveys show that people in that age-group drink just as much alcohol as they did before 1990.

Which of the following, if true of Berinia, most helps to resolve the apparent discrepancy?

A For the population as a whole, annual alcohol consumption is no lower now than it was in 1990.

B Alcohol consumption away from home, for example in bars and restaurants, is much lower among people under 21 than it was in 1990.

C The proportion of people under 21 who own a car is higher now than it was in 1990.

D Alcohol consumption is lower among people under 21 than among adults in most other age-groups.

E Alcohol-related traffic deaths among people over 21 have increased slightly since 1990.